Gearing for drilling machine



Aug; 11, i925. y 1,548,822

M. J. BURKEL ET AL GERING FOR DRILLING MACHINES Grgnal Filed May 17,1916 Patented Aug. 11, 1925.

Tte?

FICE.

MATHEW J. BURKEL AND PAUL B. wars, or AURORA, ILLINoIs, AssIeNoRs ToCLARENCE u. MnLIJIoPE, Tansania, or wrNNnrKA, ILLINOIS.

GEARING FOR DRILLING JMACHINES.

Original application filed May 17, 1916, Serial No. 98,017. Divided andthis application led December 30,

1916, Serial N0. 139,811.

To all whom t may concern.:

Be it known that we, MArIInw J. BUuxnL and PAUL B. Vms, citizens of theUnited States, and residents of Aurora, in the county of Kane and Stateof lllinois, have invented certain new and useful Improvements inGearing for Drilling Machines; and we do hereby declare that thefollowing is a iull, clear, and exact description thereof, referencebeing had to the accompanying drawings and to the letters of referencemarked thereon, which form a part of this specification.

rllhis invention relates to improvements in gearing for drillingmachines and consists of the matters hereinafter described and moreparticularly pointed out in the ,appended` claims.

The present application is a divisional application, the matter hereinhaving been irst presented in an application led by us on May 17, 1916,Serial No. 98,017. The object and the many advantages of the inventionwill appear as we proceed with our specification.

ln the drawings:

Figure 1 is a view representing a longitudinal section through adrilling machine provided with out improved gearing, in a planeindicated by the'line 1-1 of Figure 2.

Figure 2 is a viewl representing a longitudinal section through thedrilling machine in a plane at right angles to the section shown inFigure 1 as indicated by the angular line 2 2 of Figure 1.

Referring now to that embodiment of our invention illustrated in thedrawings, 5 indicates a hollow shell or casing which constitutes thebody ot a drilling machine containing the improved gearing. This shellis substantially rectangular" in cross section but is tapered on twosides toward the siindle end Gas indicated in Figure 2. .7`

indicates a spindle which has bearing in the end of the casing and hasthe familiarsocket 8 to receive the shank of a drill. The

spindle 7 is mounted close to the end wall 6 of the casing which is madeconcentric with the rotary axis of the said spindle.

A-sleeve 9, fixed in a suitable socket in the bottom wall of the casingprovides rotative Renewed March 18, 1920. SeriarlT-ofSGZOOO.

bearing for the lower length of the spindle and a radial iangc 1() atthe top of said sleeve provides a thrust bearing for a radial shoulder11 on the spindle 7, a washer 12 being interposed between the two. Astuiiing box 13 is provided to close the bearing opening in the shellabout the bottom end oi' the spindle. rlhe upper end ot the spindle hasrotative bearing in a socket formed in the top of the shell and hasthrust bearing against a head or plug 14. Said plug is retained in theshell by means of a ring 15, which is threaded into the top of saidsocket and surrounds the upper end of the plug.

A jam nut 1G is threaded upon the upper end of the plug to lock the ring15 in place. As shown, the top of the spindle is provided with a bearingaperture orb recess into which the bottom end ofthe plug 14 extends,thus providing a bearing for the top of the spindle. A radial shoulder17 provides an end thrust for the top end of the spindle, antifrictionballs being interposed between the two.

rlhe intermediate length of the spindle 7 is provided with longitudinalteeth 18.

Said teeth are engaged by a worm 19 mounted near the end of the casingwith its axis at right angles to the axis or' the spindle and to theaxis of the casing. The said worm is of considerably greater diameterthan the gear provided bythe teeth 18, on the spindle and the threads ofthe worm, approximate a right angle to the rotative axis of the worm. Bythis construction a maximum or' torque is imparted to the spindle todrive the tool. As will be maniest. the worm and gear may be of multipleor oi' single thread as re-V quired. As shown in the drawing the threadis single. The gear teeth 18 on the spindle are cut inwardly in an arc,of the radius of the worm so that .the worm may engage a maximum numberof said teeth.

The side walls of the casing are strengthened in the vicinity of thespindle by vertically extendingv internal ribs 6?, 6a which merge ordisappear transversely -intothe curved end wall-6. This constructionobviates the necessity `for the usual external strengthening rib and, asbut little clearance is required between the spindle and the end wall ofthe casing, it is possible to more closely approach the axis of thespindle to fixed parts in the neighborhood of the hole that is to bedrilled.

The worm 19 is mounted on a sleeve 26 to which it is keye'd and saidsleeve in turn, is rotatively mounted on a shaft 21 that extendstransversely through the casing 5. Said casing is provided with suitableopenings 22, 23 in its side walls to receive the shaft which inassembling the drilling machine, is inserted-through the opening 22 atone side, its movement therethrough being limited by means of a head2121. The other end of the shaft, namely the end 21b is reduced indiameter and extends through the opening 23, beyond which it is engagedand locked in place by means of al nut and washer 24. The inside wall ofthe casing 5 is formed to provide thrust shoulders 25, 26 about theshaft 21 and between these and the ends of the sleeve 2O are interposedsuitable antifriction bearing devices 27, 27. At one end of the sleeve2O is formed an integral spur gear 28. Roller bearings 29, 29 areprovided at the ends of the sleeve hetween said sleeve and the shaft 21.

A second transverse shaft- 30 is mounted in the casing near the firstnamed shaft 21 and in parallel relation thereto. Said shaft 30 has aspur gear 31 made integral with it at one and is provided with a recessat that end, which bears upon a stud 33, extending inwardly from theside wall of the casing. The stud 33 is formed on a 'disc 34, which isfixed in a suitable hole or opening 35 in the casing wall. Said disc hasa flange 36 which is spaced inwardly from its outer face and whichengages against the inside wall of the casing about said hole, the outerface of the disc being flush with the outside surface of the side wallof the casing.

On the opposite side of the casingl is a large hand hole or opening 37which is closed by a plate 38 screwed to the casing. Said plate isprovided with an opening 39, similar to the opening 35 in the oppositewall of the casing and in said opening is engaged a flanged disc 40,which is like (the disc 34 except that it has a recessed boss 41extending` into the casing to provide a bearing for the end of the shaft30. Suitable roller bearings 42 are provided between the shaft and thebearing stud 33 on the one hand and the recessed bearing boss on theother hand.

A. spur gear 43 is fixed on the shaft 30 between an integral radialshoulder 44 and a nut 45 threaded upon the shaft near its end, thebear'ng end of the shaft being reduced in diameter to permit said nut tobe slipped beyond it. Said spur gear 43 engages the spur gear 28 which,as has been described, is non-rotatively connected to the worm 19.

Near the shaft 30 and arranged parallel thereto and in the plane of theshafts 21 and 30, there is mounted a crank shaft 46. The bearing ends ofsaid shaft are formed to provide spur gears 47, 47a which are madecoaxial with the rotative axis of said shaft. Said gears have bearingrecesses 48 in their outer surfaces, which are engaged by studs 49, 49fixed in the side walls of the casing. lThe studs 49, 49 are madeintegral with flanged discs 50, 50 one of which is engaged in anaperture 51 in the side wall of the casing and the other of which isengaged in an aperture 52 in the plate that closes the hand hole 37 onthe opposite side of the casing. Said discs are similar in rtheirconstruction aud in the manner of their engagement within theirrespective openings to the disc 34 already described. Suitable rollerbearing are interposed between 'said gears 47, 47 and their associatedbearing studs 49.

The gear 47 on the crank shaft 46 engages tlre gear 31 on the shaft 30.The other gear 47 on said crank shaft is normally an idle gear; but incase the active gear 47 is broken it is only necessary to reverse thecrank shaft end for end and bring the gear 47"L into the place formerlyoccupied by the gear 47.

From the construction thus far described, it will be. apparent that therotation of the crank shaft, through the gears 47, 31, imparts rotative-Ymovement 'to the shaft 30, which in turn through the gears 43 and 28imparts rotative movement to the worm 19 so as to drive 'the spindle.

The bottom wall of the casing has a hand hole which is closed by a plate5X (see Figure 1). This hole provides for the inspection of the gearingin the casing, after it has been assembled, land also for packing` thecasing with grease.

The crank shaft 46, in 'the application of the gearing shown herein, isdriven by means of a two cylinder reciprocating pneumatic motor orengine which is mounted in the rear end of the casing 5. The cylindersof the engine are made as shown, integral with the casing, and arearranged in planes extending at an acute angle to each other andintersecting in the rotative axis of the crank shaft. 55 indicates thecylinders of said motor, and 56 indicates the associated valve chests.`Within each cylinder isi a piston 57 which is operatively connected toan associated crank arm 46a of the crank shaft. lVithin each valve chest56 is a reciprocating piston valve 58 which is operatively connected toan eccentric 46h made integral with the crank shaft, between the crankarms 46a.

Pneumatic fluid under pressure is admitted to said cylinders and valvechests, through a handle extension 60 and upon said extension is mounteda throttle valve controlling sleeve 61 for controlling the lun admissionof the pneumatic fluid and for changing the course of said fluid so thatthe rotation of the crank shaft 46 may be reversed at the will of theoperator.

As has been pointed out, the use of the Worm of larger diameter inconnection with the gear on the spindle of comparatively smallerdiameter, together with the arrangement of the teeth of the worm and ofthe gear so that the former extend at right angles to the axis of theworm, provides for a very po-werful drive and raises the eiiciency ofthe drilling machine to a maximum. By the use of the worm drive also,the spindle may be effectively operated in either direction.

Another and primary advantage of the improved gearing results from thefact that the several gears in the casing may be easily and readilychanged to suit different requirements without change of the casing orthe body of the tool. Thus in the case of the drill body illustrated, tofurther increase the speed of the tool spindle, it would simply benecessary to substitute a worm with a multiple thread instead of asingle thread shown therein and change the spindle to one having teethto be engaged by said worm. Again, the speed of the spindle for the samebody may be varied by changes in the gears 28 and 43. Thus the variedrequirements that might be met in a single body will be apparent tothose familiar with the art.

By reason of the fact that the worm teeth are substantially at rightangles to the axis of the worm it will be manifest that the drill may beused as a wrench or extractor for removing the tool from the hole cutafter the tool has been driven as far as desired.

IVe claim as our invention:

1. In a drilling machine in combination with a casing, a spindlerotatively mounted at one end of said casing, said spindle beingprovided with gear teeth substantially parallel to its axis, a shaftdetachably fixed in said casing and extending at right angles to saidspindle and a sleeve provided with an integral gear mounted on saidshaft, a worm fixed on said sleeve and engaged with the spindle gear, asecond shaft extending parallel to said first named shaft rotativelymounted in said casing, a removable gear on said shaft engaged with thegear on said sleeve, a crank shaft rotatively mounted in said casingwith its axis parallel to said first and second named shafts and gearingintermediate said crank shaft and said second named shaft for drivingsaid second named shaft in either direction.

2. In a drilling machine in combination with a casing, a spindlerotatively mounted at one end of said casing, said spindle beingprovidedV with gear teeth substantially parallel to its axis, a shaftdetachably fixed in said casing and extending at right angles to saidspindle, a sleeve provided with an integral gear mounted on said shaft,a worm fixed on said sleeve and engaged with the spindle gear, a secondshaft extending parallel to said first named shaft and rotativelymounted in said casing, a removable gear on one end of said shaft andengaged with the gear on said sleeve, a second gear made integral withthe other end of said second named shaft, a crank shaft provided at itsends with integral gears, one of said crank shaft gears meshing with thegear integral on said second shaft, and means in said casing providingbearing for said crank shaft whereby said crank shaft may be reversed(end for end).

3. In a drilling machine in combination with a casing, a spindlerotatively mounted at one end of said casing, said spindle beingprovided with gear teeth substantially paral lel to its axis, a shaftdetachably fixed in said casing and extending at right angles -to saidspindle and a sleeve provided with an integral gear mounted on saidshaft, a worm fixed on said sleeve and engaged with the spindle gear, asecond shaft extending parallel to said first named shaft rotativelymounted in said casing, said second shaft being provided a-t one endwith an integral gear having a bearing aperture and having near itsother end a gear removably fixed to it which is engaged with the gear onsaid sleeve and a removable crank shaft rotatively mounted in saidcasing with its axis parallel .to said first two named shafts, saidcrank shaft being provided with a gear in mesh with the integral gear onsaid second shaft.

In testimony that we claim the foregoing as our invention we aiiix oursignatures in the presence of two witnesses, this 16th day of November,A. I). 1916.

MATHEW J. BURKEL, PAUL B. WEIS.

lVitnesses Louis P. FosNoT, PETER L. KREITZ.

